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If downloading a new version of an affected installer isn’t an option for some reason, Rich Trouton noted in 2012 that there’s an -allowUntrusted flag for the command line installer utility that might help, as might Greg Neagle’s flatpkgfixer.py tool.Īs indicated by those posts from 2012, this is only the latest in a series of expired certificate snafus that have rendered Mac App Store apps unusable - the last one hit in November 2015 (see “ The Mac App Store Is Breaking Apps,” 12 November 2015). Thanks to Randy for the heads up on this issue and the workaround!Īs noted, this expired certificate affects more than just OS X installers - a number of Mac App Store apps suffered from it as well. Once you have completed the installation, visit System Preferences > Date & Time to reset the system date. That Terminal command sets your system date to 1 February 2016 - before the certificate’s expiration - so the installer can continue. Quit Terminal and continue the install.Enter sudo date 0201010116, press Return, and enter your password.In the OS X Installer, choose Utilities > Terminal.
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If you are in the middle of an OS X install and get tripped up by the expired certificate, Randy Singer offers a suggestion on how you can work around the problem quickly, without having to download a new installer:
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Apple won’t allow a newer Mac to download versions of OS X that aren’t compatible with that Mac, so on a 27-inch iMac with Retina display, for instance, the App Store app refuses to let you download Mac OS X 10.7 Lion. Dan Frakes wrote a guide to creating OS X 10.11 El Capitan install disks for Macworld. Those who have created any bootable install disks for OS X will need to recreate them with the new installers. The new installers are signed with a certificate that expires on 7 February 2023, so it will be quite a few years before Mac users are affected again. Scroll down to the OS X installer you want and click Download.
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Enter your App Store password if prompted.
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When used to sign an app, the certificate enables OS X to confirm that the app has not been corrupted or modified by an attacker. The Apple Worldwide Developer Relations Intermediate Certificate is required for all apps in the Mac App Store, including OS X installers.